Blending Dirt and ImageTexture?

[blastframe]

Is there a way to multiply a Dirt Map and Image Texture? I'd like to create noise at the edges of a model. I tried using the Multiply node and it didn't work as expected. Thanks!

[gordonrobb]

Best to use Mix. Use the Dirt node as the amount, and mix between your texture and whatever you want the noise to be (RGB, or Texture)

[blastframe]

Great, thanks! I will try it when I get home

[blastframe]

Hi,
I've tried the method you described and it resulted in the following output. Is there a way to multiply the noise? It seems to be in Normal blend mode. Thank you!

Dirt Settings

Dirt Render

[blastframe]

I came up with a solution that I wanted to share.

I created a Multiply node that contained my ImageTexture and a MixTexture node. Inside of the MixTexture is:

• Amount : Dirt
• Texture1 : Noise
• Texture2 : RgbSpectrum set to white

By tweaking the parameters of the Noise and Dirt nodes, I was able to create grunge effects in the corners of my models. Thanks gordonrobb for the help!

[gordonrobb]

Ok I'm confused but interested.

What is wrong with the image you show as the result? Is it that the dark parts of the noise or not darkening the original texture, but the noise image is replacing the original texture? Also, not sure I understand your solution. Can you show the node setup and the result?
Ta!

[blastframe]

Ok I'm confused but interested.

What is wrong with the image you show as the result? Is it that the dark parts of the noise or not darkening the original texture, but the noise image is replacing the original texture? Also, not sure I understand your solution. Can you show the node setup and the result?
Ta!

Hi gordonrobb,
The problem with the image I showed was that the noise was not being multiplied in its blending with the ImageTexture.

Here's my setup for Custom Dirt:

Multiply node within the Diffuse Channel

Multiply & MixTexture nodes within the Multiply node

Two Grungy Images within the Multiply node

Custom Dirt Map Within the MixTexture node

[blastframe]

This is the result (there is some ambient occlusion, but the streaking in the corners is created by this custom dirt material.

Custom Dirt Material Result

[gordonrobb]

Looks great, but your images make no sense to me. Doesn't C4D use Nodes? Not being familiar with it, I can't translate it, in my head, to a node tree.

[blastframe]

Looks great, but your images make no sense to me. Doesn't C4D use Nodes? Not being familiar with it, I can't translate it, in my head, to a node tree.

Node Tree